Low grade hematite ore granulometric level and narrow level dividing separation method

Abstract

The invention relates to a low grade hematite ore granulometric level and narrow level dividing separation method. The low grade hematite ore granulometric level and narrow level dividing separation method comprises the steps of enabling raw ore to be grinded through a primary ball grinding mill to be fed into a hydrocyclone to conduct primary coarse-fine grading operation, enabling primary coarse level hydrocyclone setting sand to be fed into a first coarse-thread device in a gravity selection process, feeding concentrates of the first coarse-thread device into a second fine-thread device, feeding tailings into a middle magnetic scavenging device, considering concentrates of the second fine-thread device as gravity selection concentrate, enabling middlings in the second fine-thread device to return to a first fine-thread device, feeding the tailings of the second fine-thread device and the concentrate of the middle magnetic scavenging device into a regrinding mill to be grinded again to return to the primary coarse-fine grading operation, and enabling overflow of the hydrocyclone of the primary coarse-fine grading operation to feed secondary coarse-fine grading operation. The low grade hematite ore granulometric level and narrow level dividing separation method is characterized in that setting sand of the secondary coarse-fine grading operation is fed into a second coarse-thread device, the concentrates of the second coarse-thread device is fed into the fine-thread device in the gravity selection process, the middlings in the second coarse-thread device are fed into the middle magnetic scavenging device in the gravity selection process, and the tailings of the second coarse-thread device are fed into flotation operation. According to the low grade hematite ore granulometric level and narrow level dividing separation method, the equipment investment is reduced, the occupied land is saved, and cost is further reduced.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a sorting method for lean hematite by classifying and narrow class. Background technique [0002] The process of coarse and fine classification in the patent 201210352536.0 mineral processing process that has been applied for is: raw ore→feeding into the cyclone for coarse and fine classification→sand settling feeding into the cycloneⅠcoarse spiral gravity separation and sweeping magnetic operation→overflow of the cyclone The flow is fed into the secondary coarse and fine classification → the sand settling of the secondary coarse and fine classification cyclone is fed into the coarse screw II → the concentrate of the coarse screw II is fed into the fine screw II, the medium ore of the coarse screw II is fed into the sweeping magnetic II, and the coarse The tailings of Luo II are fed into the flotation operation, the concentrate of Jing Luo II is one of the gravi...

AI Technical Summary

Problems solved by technology

[0003] This patent adds secondary coarse and fine grading cyclone grading, which solves the problem that the re-selection operation has a wide particle size level and fine-grained iron minerals cannot be well recovered and re-selected The problem of high grade tailings reduces the cost of concentrate, but at the same time, the production process of ore dressing increases the operating circuits of coarse screw II, fine screw II and sweeping magnetic II

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